Omron Rotary Encoder E6A2-CW5C 200P/R 0.5M

From the shop's description

This is Omron quadrature incremental rotary encoder E6A2-CW5C with 200 P/R (pulse per revolution) of compact size (25mm external diameter). The encoder outputs gray code which you can interpret using a PLC, microcontroller or Arduino and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems. Encoders of this kind are often used in medical devices, productions lines, CNC machines and dead reckoning navigation. Features Resolution: 200 Pulse/Rotation Encoding Method: Incremental Input Voltage: 12 - 24VDC Maximum Rotating Speed: 5000rpm Allowable Radial Load: 10N Allowable Axial Load: 5N Cable Length: 50cm Shaft Diameter: 4mm External Diameter: 25mm Datasheet for encoder E6A2-CW5C Encoder manual and Arduino example code